The total antioxidant activity of essential oils and extracts from Atractylodes chinensis and A. chinensis preparata. was evaluated by three methods, namely, 1-diphenyl-2-picryl-2-picrylhydrazyl (DPPH) radical scavenging,〔2,2-azino-bis-3-ethylbenzothiazoline-6-sulfonic acid〕diammonium salt (ABTS) radical scavenging,and ferric reducing antioxidant power(FRAP) assay. The results showed that the ethyl acetate extract of Atractylodes chinensis had higher activity (DPPH: IC50=6.03 ug/mL; ABTS: IC50=3.59 ug/mL: FRAP: FRAP =3186.67 umol TE/g ), and its antioxidant activity was significantly decreased after stired by wheat bran. This paper clearly shows that Atractylodes chinensis is a good natural resource of antioxidants。